Provided are a wireless charging apparatus in which multiple coils overlaps with one another on separated cores, and a wireless charging system including such wireless charging apparatus. According to an embodiment of the present disclosure, the wireless charging apparatus includes a plurality of plate coils spaced apart from one another, a first coil disposed on the plurality plate coils, and a second coil disposed on the first coil to partially overlap with the first coil.
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2. The wireless charging apparatus of claim 1, wherein one of the at least one first coil is disposed on each of the plate cores within an area formed by the corresponding plate core.
3. The wireless charging apparatus of claim 1, wherein one of the at least one first coil is disposed on each of the plate cores to partially overlap with an area formed by the corresponding plate core.
4. The wireless charging apparatus of claim 1, wherein a total number of coils including the at least first and second coils disposed above the plate cores is equal to a total number of the plate cores.
Wireless charging systems use inductive coupling to transfer power between a transmitter and a receiver. A common challenge is achieving efficient power transfer while maintaining compact and lightweight designs, especially in multi-coil systems where alignment and interference between coils can reduce performance. This invention relates to a wireless charging apparatus with an improved coil arrangement. The apparatus includes a plurality of plate cores, each made of a magnetically permeable material, arranged in a stacked configuration. At least two coils are disposed above the plate cores, with each coil wound around a portion of the plate cores. The total number of coils in the apparatus is equal to the total number of plate cores, ensuring a one-to-one correspondence between coils and plate cores. This configuration enhances magnetic coupling efficiency by reducing flux leakage and interference between adjacent coils. The apparatus may also include a housing to support the plate cores and coils, and a control circuit to manage power transmission. The design allows for scalable multi-coil systems with improved power transfer efficiency and reduced electromagnetic interference.
5. The wireless charging apparatus of claim 1, wherein the plate cores that are spaced apart from one another are positioned in a matrix configuration.
10. The wireless charging apparatus of claim 1, wherein a height compensating core is placed above the plate cores to compensate for a height difference between one of the at least one first coil and one of the at least one second coil.
A wireless charging apparatus includes a charging system with multiple coils for transmitting and receiving power. The apparatus addresses the challenge of maintaining efficient power transfer when there is a height difference between the transmitting and receiving coils, which can reduce charging efficiency or cause misalignment. To solve this, the apparatus incorporates a height compensating core positioned above the plate cores. The height compensating core adjusts for variations in the distance between the transmitting and receiving coils, ensuring optimal alignment and consistent power transfer. The plate cores, which are part of the charging system, support the coils and help direct the magnetic field between them. The height compensating core compensates for any discrepancies in coil height, improving the overall performance of the wireless charging system. This design ensures reliable charging even when the coils are not perfectly aligned or when the distance between them varies. The apparatus is particularly useful in applications where precise alignment is difficult, such as in automotive or industrial settings.
11. The wireless charging apparatus of claim 1, further comprising an insulating sheet provided on the at least one first coil in an area in which the at least one first coil overlaps with the at least one second coil.
A wireless charging apparatus includes a first coil for transmitting or receiving power and a second coil for receiving or transmitting power, respectively, positioned to overlap with the first coil. The apparatus further includes an insulating sheet placed on the first coil in the overlapping area between the first and second coils. The insulating sheet prevents direct contact between the coils, reducing electrical interference and improving charging efficiency. The apparatus may also include a magnetic shield layer to minimize electromagnetic interference and a support structure to maintain alignment between the coils. The insulating sheet is designed to withstand high temperatures and mechanical stress while maintaining electrical insulation properties. This configuration ensures reliable wireless power transfer with reduced energy loss and interference.
12. The wireless charging apparatus of claim 1, wherein separation distances between the plate cores are substantially the same.
A wireless charging apparatus includes a plurality of plate cores arranged in a stacked configuration to form a charging module. The plate cores are spaced apart by separation distances that are substantially equal, ensuring uniform magnetic field distribution and efficient energy transfer. Each plate core is made of a ferromagnetic material to guide and concentrate the magnetic flux generated by a primary coil, reducing leakage and improving charging efficiency. The apparatus may include multiple such charging modules, each with its own set of plate cores, to support multi-device charging. The uniform spacing between the plate cores minimizes eddy current losses and thermal effects, enhancing overall performance. The design allows for precise alignment of the magnetic field with the receiving device, ensuring consistent power delivery. This configuration is particularly useful in high-power wireless charging systems where thermal management and efficiency are critical. The apparatus may also include cooling mechanisms to dissipate heat generated during operation, further improving reliability. The uniform spacing of the plate cores ensures optimal magnetic coupling, reducing interference and improving charging speed. The invention addresses the need for efficient, high-power wireless charging solutions with minimal energy loss and thermal buildup.
15. The wireless charging system of claim 13, wherein the at least one battery apparatus receives the charging power through any one group of transmitting coils, in which the plurality of transmitting coils are grouped based on positions of the plurality of plate cores.
16. The wireless charging system of claim 13, wherein the at least one battery apparatus is configured to receive the charging power from any one group of transmitting coils including transmitting coils or any one transmitting coil, which is closest to the receiving coil, among the plurality of transmitting coils disposed above the plurality of plate cores.
17. The wireless charging system of claim 16, wherein the wireless charging apparatus sequentially applies a current to the plurality of transmitting coils for a non-overlapping period of time, receives a response signal from the battery apparatus through the receiving coil into which a voltage is induced based on the current, and supplies the charging power from one or plural transmitting coils among the plurality of transmitting coils, based on the received intensity of the response signal.
18. The wireless charging system of claim 17, wherein when the current is applied to any one transmitting coil, and an intensity of the received response signal is greatest, the wireless charging apparatus determines a group of transmitting coils including the one transmitting coil associated with the greatest intensity, as a group of transmitting coils to supply the charging power, and selectively applies the current to the determined group of transmitting coils to supply the charging power to the at least one battery apparatus.
19. The wireless charging system of claim 17, wherein when the current is applied to any one transmitting coil and an intensity of the received response signal is greatest, the wireless charging apparatus determines the one transmitting coil associated with the greatest intensity as a transmitting coil to supply the charging power, and selectively applies the current to the determined transmitting coil to supply the charging power to the at least one battery apparatus.
A wireless charging system optimizes power transfer efficiency by dynamically selecting the most effective transmitting coil for charging a battery apparatus. The system includes multiple transmitting coils and a receiver coil in a battery apparatus. During operation, the system applies a current to each transmitting coil sequentially and measures the intensity of a response signal received from the battery apparatus. The transmitting coil that produces the strongest response signal is identified as the optimal coil for power transmission. The system then selectively applies current to this coil to supply charging power to the battery apparatus. This approach ensures efficient power transfer by minimizing losses and maximizing alignment between the transmitting and receiving coils. The system may also include a controller to manage the current application and signal measurement processes, ensuring precise and adaptive coil selection based on real-time conditions. This method improves charging efficiency, reduces energy waste, and enhances the reliability of wireless charging systems.
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December 9, 2019
October 11, 2022
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